<div class="container">
        <div class="logo"><a href="./index.html">学生选课后台管理系统</a></div>
        <div class="open-nav"><i class="iconfont">&#xe699;</i></div>
        <ul class="layui-nav right" lay-filter="">
          <li class="layui-nav-item">
            <a href="javascript:;">Administrator</a>
            <dl class="layui-nav-child"> <!-- 二级菜单 -->
              <dd><a href="change_password">修改密码</a></dd>
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          <li class="layui-nav-item"><a href="/">前台首页</a></li>
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